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In page Drooling:

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A sudden onset of drooling may indicate poisoning – especially by pesticides or mercury – or reaction to snake or insect venom. Excess capsaicin can cause drooling as well, an example being the ingestion of particularly high Scoville Unit chili peppers. Some neurological problems cause drooling. Medication can cause drooling, either due to primary action or side-effects; for example the pain-relief medication Orajel can numb the mucosa.[citation needed]